4.1 - Portballintrae Bad HE Flashcards
1
Q
What hard engineering is in place?
A
Grounds
Revetments
Rip-rap
2
Q
What disrupted natural sediment movement
A
Enlarging Leslie’s pier in 1970
3
Q
Effect of Leslie’s pier
A
Starved beach as waves concentrated so more energy - more destructive and take more sediment away in backwash
4
Q
How much sediment is lost a year
A
1000m^2/yr
5
Q
What does the hard engineering not take into account
A
Sediment movement
Waves refracted so now swash-aligned
6
Q
Meaning of swash-alignment
A
Waves break parallel to the beach not at an angle (drift-aligned) so no LSD
